Fig. 2From: A comparison study of percutaneous endoscopic decompression and posterior decompressive laminectomy in the treatment of thoracic spinal stenosisIntraoperative views. a The diamond abrasor drilling the lamina. b After the OLF were removed by endoscopic instruments, the dura sac was visible. c The nerve root was exposed. d The whole dura sac was exposed (white area) and fluctuated wellBack to article page